<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{ this.city }}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper"
               v-for="item in hotCities"
               :key="item.id"
               @click="handleCityClick(item.name)"
          >
            <div class="button">{{ item.name }}</div>
          </div>
        </div>
      </div>
      <div class="area"
           v-for="(item,key) in cities"
           :key="item.id"
           :ref="key"
      >
        <div class="title border-topbottom">{{ key }}</div>
        <div class="item-list">
          <div class="item border-bottom"
               v-for="Inner in item"
               :key="Inner.id"
               @click="handleCityClick(Inner.name)"
          >{{ Inner.name }}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapState, mapMutations } from 'vuex'
import BScroll from 'better-scroll'
export default {
  name: 'List',
  props: {
    cities: Object,
    hotCities: Array,
    letter: String
  },
  methods: {
    handleCityClick (city) {
      // this.$store.commit('getChange', city) //用了mapMutations 就可以不用那么麻烦了
      // this.$store.dispatch('changeCity', city) //因为这里没有用到异步的操作，所以可以跳过actions直接用mutations
      this.getChange(city)
      this.$router.push('/')
    },
    ...mapMutations(['getChange'])
  },
  computed: {
    ...mapState(['city'])
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
  }
}
</script>

<style lang="stylus" scoped>
  .border-topbottom
    &:before
      border-color #ccc
    &:after
      border-color #ccc
  .border-bottom
  &:before
    border-color #ccc
  .list
    overflow hidden
    position absolute
    top 1.58rem
    right 0
    bottom 0
    left 0
    .title
      line-height .54rem
      background: #eee
      padding-left .2rem
      color #666
      font-size .26rem
    .button-list
      overflow hidden
      padding .1rem .6rem .1rem .1rem
      .button-wrapper
        float left
        width 33.33%
        .button
          margin .1rem
          padding .1rem 0
          text-align center
          border .02rem solid #ccc
          border-radius .06rem
    .item-list
      .item
        line-height .76rem
        padding-left .2rem
</style>
